#ifndef _hwRefractReflectShader_NV20
#define _hwRefractReflectShader_NV20

//-
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///////////////////////////////////////////////////////////////////
//
// NOTE: PLEASE READ THE README.TXT FILE FOR INSTRUCTIONS ON
// COMPILING AND USAGE REQUIREMENTS.
//
// DESCRIPTION: NV20-specific (Geforce3) sample shader.
//				<fill up later>
//
//  This shader builds on the foundation demonstrated in the 
//  hwUnlitShader.
//
//
///////////////////////////////////////////////////////////////////

#include <maya/MPxHwShaderNode.h>
#include "MTextureCache.h"


class hwRefractReflectShader_NV20 : public MPxHwShaderNode
{
public:
                    hwRefractReflectShader_NV20();
    virtual         ~hwRefractReflectShader_NV20();
	void			releaseEverything();

    virtual MStatus compute( const MPlug&, MDataBlock& );
	virtual void    postConstructor();

	virtual MStatus	geometry( const MDrawRequest& request,
							  M3dView& view,
							  int prim,
							  unsigned int writable,
							  int indexCount,
							  const unsigned int * indexArray,
							  int vertexCount,
							  const int * vertexIDs,
							  const float * vertexArray,
							  int normalCount,
							  const float ** normalArrays,
							  int colorCount,
							  const float ** colorArrays,
							  int texCoordCount,
							  const float ** texCoordArrays);

	virtual int		normalsPerVertex();
	virtual int		texCoordsPerVertex();
    static  void *  creator();
    static  MStatus initialize();
    static  MTypeId id;

	MTextureCache	*m_pTextureCache;

	void			loadVertexProgramGL( M3dView& view );
	float*			computeBinormals(int indexCount, const unsigned int * indexArray, 
									 int vertexCount, const float* vertexArray, 
									 const float* normalsArray, 
									 const float* texCoordsArray);

protected:

	void		init_ext(const char *ext);

	MStatus		loadTextures(const MDrawRequest& request, M3dView& view);
	void		initCombiners(const MDrawRequest& request, M3dView& view);

	MStatus		preDraw (const MDrawRequest& request, M3dView& view);
	MStatus		postDraw(const MDrawRequest& request, M3dView& view);

    static MObject  colorR;
	static MObject  colorG;
	static MObject  colorB;
	static MObject  color;

    static MObject  refractionIndex;
    static MObject  reflectivity;

	// Callbacks that we monitor so we can release OpenGL-dependant resources before
	// their context gets destroyed.
	MCallbackId fBeforeNewCB;
	MCallbackId fBeforeOpenCB;
	MCallbackId fBeforeRemoveReferenceCB;
	MCallbackId fMayaExitingCB;

	void attachSceneCallbacks();
	void detachSceneCallbacks();
	static void releaseCallback(void* clientData);

private:

	// Images to store the cubeMap texture names
	//
	MImage theImage_XP;
	MImage theImage_XN;
	MImage theImage_YP;
	MImage theImage_YN;
	MImage theImage_ZP;
	MImage theImage_ZN;

	GLuint	vertex_program_id;		// handle for the Vertex Program
	GLuint	fTextureName;			// texture name
	MString currentTextureNames[6];	// cubemap file texture names

	float	fRefractionIndex;
	float	fReflectivity;

	MVector	fCameraRotationAxis;
	double	fCameraRotationAngle;
};

#endif /* _hwRefractReflectShader_NV20 */